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A critical authorization bypass vulnerability exists in the `AuthorizeActionFilter` class within the DotVVM framework, failing to perform any authorization checks and allowing attackers to bypass intended access restrictions without specific exploitation techniques, impacting all users relying on `AuthorizeActionFilter` for security. Patched versions include DotVVM 4.3.15, 4.2.11, and 5.0.0-preview09; `AuthorizeAttribute` can be used as a workaround.